Multiple roll mill



Jan. 23, 1945. sssssss ON 2,368,030

In Ventor'.'-

owe/7 10/3500 j Mae 6,

Attorneys Jan, 23, 1945. s, LARSSQN 2,368,030

MULTIPLE ROLL MILL Filed April 20} 1943 2 Sheets-Sheet 2 Patented Jan. 23, 1945 MULTIPLE ROLL MILL Sven Larsson, Sandviken, Sweden Application April 20. 1943, Serial No. 483,717 In Sweden October 11, 1941 3 Claims.

roll housing and the intermediate rolls guided I in their positions by resting against at least three working and backing rolls or only backing rolls.

This rolling mill construction has many disadvantages. The following ones may be mentioned:

The diameter of the outer backing rolls cannot be made suiliciently large to insure a atisfactory mounting. Also the bending of said rolls through the roll pressure becomes large, due to the small diameter. Since as a consequence of this construction to a great extent one roll rests against two rolls in the two halves of the rolling mill all of the rolls in each intermediate roll group fr'nust, moreover, mutually have exactly the same diameter in order to obtain only rolling friction between the rolls. Moreover, the possibilities of supplying lubricating and cooling liquid to the intermediate-rolls will not be good. The side backing rolls of the outer group in the upper part will, moreover, lie so close to the corresponding rolls in the lower part oi the roll housing that the mounting of the guide casing is rendered considerabiy more dimcult.

The purpose of the present invention is to eliminate said disadvantages. This is obtained thereby that to the outermost backing roll group is given the same number of rolls as to the outermost group but one whereby each of themolls in the former group supports its individual group in the latter group, and thereby that the rollsin the outermost group but one are guided by bearings which 'in their turn are guided in such a way in the lateral direction that their rolls may be displaced by the rolling pressure toward their respective outermost backing rolls.

The invention is illustrated on the accompanying drawings, in which Fig. 1 isa cross section and Fig. 2 a vertical section through an eighteenroll mill.

Fig. 3 is a sectional view through a ten-roll mill.

Fig. 4 is an alternative mounting of the rolls oi. the outer backing roll group, viewed from above.

The machine shown in Figs. 1 and 2 is an eighteen-roll mill with three backing rolls in each half of the rolling mill. Only the parts or the rolling mill necessary for elucidating the invention are disclosed and described.

The working rolls l and l' are driven each from its side of the rolling mill, and are guided in their positions by resting against the strip, sheet, skeip or the like a'to be rolled and against the roll pair 2, 2' and 3, 3' respectively of the first backing roll group. Each oi said rolls 2, 2' is guided between the working roll and two of the rolls 4, 4', 4" o! the second backing roll group.

The axes of the side backing rolls 8, 4 and 2 lie in the same plane and so do also the side backing rolls 6", l" and 2', compare also Fig. 3. The axes of the intermediate backing rolls 6' and 4' lie in the ame plane as the resultant of the roll pressure from 2 and 2' against 4'. Consequently, no lateral pressure from the rollpressure on the bearings 8, 8' and l" arises, and therefore said bearings only serve to guide the intermediate rolls 4, 4' and l" in the respective planes. The absence of lateral pressure also characterizes the rolling mill according to Fig. 3.

It is not shown on the drawings how the bearings 8, 8' and 8" and so on are arranged for the required displacement because diflerent devices may be chosen for this purpose. However.

.the dlsplaceability is indicated in Fig. 2 by a play on both sides of the bearings in the mill housing. Said housing represents the open type. The upper part indicated by H) is thus detachably connected with the'lower part by means of bolts Ii. The two parts may alternatively be hinged to one another in a way known per so so that the upper part can be swung upward to facilitate a rapid opening of the rolling mill.

In the device shown in Fig. 4, which can be applied at least at the outer backing rolls, the roll is shaped like a sleeve and rotates on rollers i2, the so-called needles, around the shaft 13'. Thus, the roll can have stationarily mounted necks. Said mounting on so-called needles, which is known per se, is particularly suitable in the rolling mill type in question. As, thanks to 'this invention, the outer rolls obtain a relatively large diameter their dimensions as well astheir mounting may easily be adjusted with respect to the occurring roll pressures. By providing the roll shaft with flanges ll the needles may be guided while the flanges serve as distance supports (or the side pieces of the mill housin when said side pieces are tightened by bolts ll.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A multiple roll mill, in which the working roll which is driven from the outside in the upper as well as the lower half of the rolling mill is supported by two backing rolls and said backing roll; in their turn are supported by a-group of rolls of larger diameter, and said rolls are further supported by at least one turther backing roll group, the outermost backing roll group above the path oi the material to be rolled as well as the corresponding backing roll group below the said path having the same number of rolls as the outermost group but one, each roll in the former group supporting one roll in the latter group, the rolls or the outermost group but one each being a,ses,oso

guided in its bearings which are displaceable radially or approximately radially towards the bearings of the respective outermost backing roll and which are suitably guided for this displacement.

2. A rolling mill as claimed in claim 1. in which the working rolls are each driven irom the side of the rolling mill on which they are located and are guided in their positions by resting against 

